Hello I would like to create a paypal buy button which has a dynamic set amount. I would like to pass the amount by a text input field within the form and the item_number by a hidden field.
The issue is that what ever I do I get a encrypted s-xclick button from the paypal website. This button does not allow hidden variables being placed in the form.
I think what I need is a xclick button. My goal is to allow users to increase their internally credit of my website.
EDIT (moving the addition to the question from the answer to the question)(from here @tokam:
To add this to the discussion I would like to show my current solution for the problem:
Here we have some Javascript validation which helps the user with the input. Recognize that it opens a lightbox on success
function validatePaypalForm()
{
var val = $('#paypalPaymentAmount').val().replace(/\s*$/, "").replace(/,/ , ".").replace(/€$/, "");
var errormsg = '';
var ret, amountField;
if( val==='' || isNaN( parseFloat(val) ) || !isFinite(val) )
{
errormsg = 'Bitte geben Sie einen gültigen Betrag an';
}else if( parseFloat( val ) < <?php echo $this->minimum?> )
{
errormsg = 'Das Einzahlungsminimum beträgt <?php echo $this->minimum?>€';
}
ret = ( errormsg === '' );
amountField = $( '#paypalAmountField' );
if( ret )
{
amountField.removeClass( 'error' );
$('#paypalAmountErrorMessage').html( ' ' );
$('#paypalPaymentAmount').val( val );
fb.start(
'<p><strong>Sie werden in kürze zur Seite von Paypal weitergeleitet.</strong></p>',
'width:700 showPrint:false modal:true showClose:false showOuterClose:true showItemNumber:false closeOnNewWindow:false outsideClickCloses:true innerBorder:0 imageClickCloses:false scrolling: no'
);
}else{
amountField.addClass( 'error' );
$('#paypalAmountErrorMessage').html( errormsg );
}
return ret;
} Here comes my button now. The issues I am having with are e.g. that it is easy for the user to set an other currency code. I could handle this in my IPN Listener by refunding the payment. Are there other issues which come with an unencrypted changeable button?
<form onsubmit="return validatePaypalForm();" class="stn-form" action="https://www.paypal.com/cgi-bin/webscr" method="post">
<fieldset id="fieldset-p"><legend><span>2.</span>myproject Guthaben aufladen per Paypal Zahlung</legend>
<div id='paypalAmountField' class="field">
<label for='paypalPaymentAmount' >Betrag €:</label>
<input id='paypalPaymentAmount' type="text" name='amount' value='' />
<span style='display:block;' id='paypalAmountErrorMessage' class='errorText'>' </span>
</div>
<input type="hidden" name="cmd" value="_xclick">
<input type="hidden" name="business" value="THE_ID_OF_MY_CLIENT">
<input type="hidden" name="lc" value="DE">
<input type="hidden" name="item_name" value="myproject Advertiser Vorkasse">
<input type="hidden" name='item_number' value="11500">
<input type="hidden" name="currency_code" value="EUR">
<input type="hidden" name="button_subtype" value="services">
<input type="hidden" name="no_note" value="1">
<input type="hidden" name="no_shipping" value="1">
<input type="hidden" name="bn" value="PP-BuyNowBF:btn_paynowCC_LG.gif:NonHosted">
<input type="hidden" name="rm" value="1">
<input type="hidden" name='cbt' value="Zu myproject.de zurückkehren">
<input type="hidden" name="currency_code" value="EUR">
<input type="hidden" name="return" value="http://myproject.somedomain.net/advertiser/guthaben-aufladen/ret/success" />
<input type="hidden" name="cancel_ return" value="http://myproject.somedomain.net/advertiser/guthaben-aufladen/ret/canceled" />
<div class="actionrow">
<input type="image" src="https://www.paypalobjects.com/de_DE/DE/i/btn/btn_paynowCC_LG.gif" border="0" name="submit" alt="Jetzt einfach, schnell und sicher online bezahlen – mit PayPal.">
<img alt="" border="0" src="https://www.paypalobjects.com/de_DE/i/scr/pixel.gif" width="1" height="1">
</div>
</fieldset>
</form>
